German & Austro-Hungarian Aero Engines of WWI documents all aero engines from Germany and the Austro-Hungarian Empire from the start of engine development until the end of WWI, including engines for both airships and airplanes. In addition, many pre-war German airplanes are illustrated, including the very first German airplane. The book is published in three volumes totaling 740 pages with hundreds of photographs and drawings in each volume. Volume 1 has 234 pages, Volume 2 has 232 pages, and Volume 3 has 274 pages.